Moisture- and tear-resistant plastic envelope protects packing lists from water and handling damage. Permanent adhesive backing keeps documentation securely in place. Printed inPACKING LIST ENCLOSED.in Printing and bright orange background conceal enclosure contents for added security. Envelope Size: 5 1/2 x 4 1/2; Envelope/Mailer Type: Packing List; Closure: Self-Adhesive; Security Tinted: Yes.